Objective   To design a new type of assemble lumber interbody fusion cage (ALIFcage) made of polyetheretherketone (PEEK) and to evaluate its cage fusion effect on goat model of lumber interbody fusion.    Methods   Sixteen healthy adult goat aged 1 to 2 years old and weight 25 to 35 kg were used in this experiment. After ALIFcage were designed and made

these ALIFcages were implanted into the intervertable space

then these goat were monitored

observed and evaluated for fusion effect during operative time till the end of experiment.    Results   All goat models were living. X-ray photography showed well fusion result and the outcome met the demand for experiment of lumber interbody fusion.    Conclusion   The ALIFCAGE has a unique design and demonstrate good fusion result. It is easy to reach into lumber interbody space from lumber 2 to lumber 5 through ventrilateral approach during operation. Reproducible animal model of lumber interbody fusion is established and used in interbody fusion experiment research.